Research on Non-contact Pollution Monitoring Method of Composite Insulator Based on Space Electric Field

Insulator contamination directly threatens the safe and stable operation of the overhead line. Through spatial electric field monitoring, it is expected to realize insulator pollution condition monitoring and contamination flashover warning in a non-contact way. So in this paper, the spatial electric field distribution characteristics of 110 kV composite insulators are simulated, where the effects of different surface states and their discharge levels on the spatial electric field of insulators are analyzed. On this basis, a non-contact monitoring method for composite insulator pollution based on the spatial electric field is proposed. The results show that there are significant differences in the spatial electric field of the composite insulator among three conditions of clean, pollution layer wetting, and dry band arcing. With the increase of pollution layer wetting and dry band arcing, it would lead to an increase of the amplitude of the spatial electric field of the insulator. It is feasible to identify the degree of pollution layer wetting as well as dry band arcing of the insulator string, by fixed-point monitoring the spatial electric field signal at the cross-strand of d = 0.5 m and directly opposite the last three positions. Research results can provide references for the online monitoring of overhead line pollution insulators and its flashover warning.